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A Flexible Copper Electrode Array for High-Density Surface Electromyography.

Chaoxin Li1,2, Chenghong Lu1,2, Jiuqiang Li1,2

  • 1Division of Life Sciences and Medicine, School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Hefei 230022, China.

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Summary

This study introduces a flexible, low-cost 16-channel copper electrode array for precise forearm muscle monitoring. The novel design ensures stable, high-quality surface electromyography (sEMG) signals during complex movements, advancing human-machine interfaces.

Keywords:
multi-channel sEMG sensorsmulti-site muscle monitoringserpentine interconnects

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Area of Science:

  • Biomedical Engineering
  • Wearable Technology
  • Sensor Development

Background:

  • Surface electromyography (sEMG) is vital for human-machine interfaces (HMIs) and rehabilitation.
  • Traditional sEMG electrodes struggle with signal crosstalk and unstable contact in forearm muscles due to deformation.
  • Need for advanced sensing solutions for accurate muscle activity monitoring.

Purpose of the Study:

  • To develop a flexible, low-cost, high-density 16-channel copper electrode array for forearm muscle monitoring.
  • To overcome limitations of traditional sEMG sensors in dynamic environments.
  • To enable precise spatiotemporal mapping of forearm muscle activation.

Main Methods:

  • Fabrication of a conformable 16-channel copper electrode array with serpentine interconnects.
  • Utilizing a facile process to transform rigid copper into a flexible sensing interface.
  • Integration with a customized wireless data acquisition system for real-time monitoring.

Main Results:

  • The flexible array demonstrated excellent stretchability and isolation of motion-induced stress.
  • High-density 2x8 array enabled spatiotemporal mapping of flexor and extensor muscle groups.
  • Successful real-time, multi-channel sEMG monitoring of hand movements with clear muscle activation patterns.

Conclusions:

  • The developed low-cost, flexible sensor array offers high-performance sEMG monitoring.
  • It provides a promising tool for complex gesture decoding and electromyographic imaging.
  • The technology advances the development of next-generation wearable HMIs.